... -1999 Uses: mainly used in the general structure and mechanical structureRepresentative material (grade): carbon steel 20,45 # steel; steel Q345, 20Cr, 40Cr, 20CrMo ,30 ... steel pipe.(2)we also supply an extensive range of steels, such as" angles, flat steel, square steel, welded pipe, galvanized pipe, steel mill, hot-rolled steel, I-steel ...